Examine source code of Solid red and black

{
  "name": "Solid red and black",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "2019-11-30 17.58.35.jpg"
    },
    "colors": {
      "frame": "rgba(3, 10, 26, 1)",
      "tab_background_text": "rgba(0, 0, 0, 1)",
      "toolbar": "rgba(8, 0, 0, 1)",
      "bookmark_text": "rgba(222, 0, 15, 1)",
      "toolbar_field": "rgba(252, 3, 7, 0.99)",
      "toolbar_field_text": "rgba(0, 0, 0, 1)"
    }
  }
}